[ncl-talk] Plotting nam winds on regional map

[Mary Haley]

Hi Andrew,

Setting "trGridType" to TriangularMesh will not work for vectors.  This is
currently only available for contours.  We have it on our list to do this
for vectors, but it could be awhile before we get to it. However, you
shouldn't need this in your case. You have 2D lat/lon arrays, which you can
generate vectors from without needing a triangular mesh.

Are you getting any kind of error message when you execute this NCL script?

To debug this, I suggest first removing this line, since it won't work
anyway:

       vres at trGridType="TriangularMesh"
and then temporarily commenting these two lines so that the vector plot
will actually get drawn when "gsn_csm_vector" is called, and you can make
sure it looks okay:

;       vres at vfXArray = lon2d
;       vres at vfYArray = lat2d


If you continue to have problems, then it would help if you could provide
an updated script *and* the data file. You can use our ftp for the data
file:

http://www.ncl.ucar.edu/report_bug.shtml#HowToFTP

--Mary


On Sat, Dec 19, 2015 at 10:16 AM, Andrew Kren - NOAA Affiliate <
andrew.kren at noaa.gov> wrote:

> I have a script that I run in real-time to generate NAM forecast output at
> various pressure levels and plot variables. Attached is my script. I also
> attached a plot of the 500 mb heights/vorticity from the program.
>
> For some reason, I cannot get the u and v winds to plot, meaning the wind
> barbs will not show up on the plot. I followed the convention for a 2 deg
> lat/lon grid, since NAM is on a lon2d/lat2d grid. I used gsnAddCyclic =
> false, declared my vfXArray and vfYArray, and used TriangularMesh for my
> grid, the same settings I used for plotting the vorticity, which showed up
> fine. I am thus stumped why the winds won't show up. Any advice is most
> appreciated. Sorry for the long ncl code.
>
> Thanks,
>
> --
> Andrew Kren, PhD
> Research Scientist I, Global Observing Systems Analysis (GOSA) Group
> NOAA ESRL Global Systems Division (Rm 3C515)
> 325 Broadway, Boulder, CO 80305
> (303) 497-5418
>
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